Write the showcase examples without showcase-only hooks

Plan step 38 review: the component sections' code samples, which an
application copies, carried 60 data-md-showcase-* hooks that only
showcase.css draws (a sized loading indicator, the plain badge's own
colours, a bordered bar frame, the navigation demos' frames, a table's
scroll wrapper...), so a copied sample did nothing in the application.
They now write what an application has: <x-surface outlined corner>
for a frame and a line, <x-row> for the FAB menu's corner, and an
inline style from the tokens for a size, a scroll box or a colour,
as the Containment batch already did. The side sheet demo takes
align="stretch", which holds in both of <x-row stack-below>'s modes,
instead of a hook that undid align="start" once stacked. The menu
icon colours go through icon-class with two unlayered application-like
classes, which the sample's comment names, and the fields' and date
picker's widths are inline styles now that style reaches their roots.
The radio hint said "from sm"; it is medium.

showcase.css keeps only the frame and the foundation specimens; its
header describes the file instead of the batches that wrote it. The
tests reject a showcase hook or a class outside md-* and the named
application classes in any example, a showcase.css selector outside
its own hooks, and a hook no showcase view renders.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9

resources/views/showcase/sections/chips.blade.php

@@ -53,7 +53,7 @@
             BLADE,
         'A set that scrolls' => <<<'BLADE'
             {{-- M3 asks an overflowing chip row for a visible affordance: the edge it can still scroll towards fades, and on a mouse a button sits over it. --}}
-            <div data-md-showcase-chip-scroll>
+            <div style="width: 100%; max-width: 384px;">
                 <x-chip-set label="Sort and filter" hint="Drag, or use the arrow keys" scroll>
                     <x-chip type="filter" label="Newest" name="sort[]" value="newest" :selected="true" />
                     <x-chip type="filter" label="Largest" name="sort[]" value="largest" />